Which of the following glands is large sized at birth but reduces in size with ageing ?

Options

A. Pineal
B. Pituitary
C. Thymus
D. Thyroid

Answer

C

Explanation

As the thymus shrinks, its tissues are replaced by adipose tissue. The shrinking is due to the reduced role of the thyroid in adulthood. The immune system produces most of its T cells during childhood and requires very few new T cells after puberty.